The report noted: "The Metropolitan Manila Development Authority (MMDA) said the collision, which occurred in the tunnel of EDSA-Aurora’s southbound lane, involved a Jam Transit bus, a 5 Star bus, and a CEM Transport bus. Authorities have yet to determine how the collision occurred. The MMDA noted that buses are not allowed to pass through EDSA’s tunnels."

As of ABS-CBNNews.com’s posting, 9:45 a.m. "a portion of the EDS-Aurora southbound lane was blocked, causing heavy traffic build-up in the area.